Here’s how to configure OSX,iPad,iPhone to use an enterprise Cisco VPN concentrator (which is what you connect to from internet when you want to virtually join a company or school’s LAN).
Open System Preferences –> Network –> click the plus sign (Create a new service). On the iPhone, choose Settings –> General –> Network –> VPN –> Add VPN Configuration. On the Mac, chose VPN as the interface. Choose Cisco IPSec as the VPN type, and supply a service name as a description (an arbitrary name for the connection, whatever makes sense to you).
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